Suggestions required for small embedded computer

[Vindhyachal.takniki]

1. I need a camera interface which some audio output. Image taken has to be processed inside & its contents to be spoken out.
Earlier I thought of using raspberry pi as it has camera & audio out, then internally OpenCV can be used.
But it has large form factor, I need something smaller. Also raspberry pi has large footprint & major problem is its current consumption also.
I need to tailor down my application for this task only.

2. Any suggestions on it which board can be used?

[ebclr]

Do you know pi zero ?

What about arducam ?